$\frac{d^2}{dx^2}\left(\arctan\left(\sin\left(3x\right)\right)\right)$

$x^2\frac{dy}{dx}=\left(x+1\right)y$

$3x+5<20$

$\frac{d}{dx}\left(\left(5x+6y\right)^{5x+6y}\right)$

$\int\left(\frac{\log\left(x-4\right)}{\left(x-4\right)\sqrt{5+\log\left(x-4\right)}}\right)dx$

$f\left(x\right)=\frac{1}{2}\ln\left(x^3\right)$

$2\left(5-7\right)^2-3\left(7-10\right)^3+\sqrt{81}-\sqrt[3]{27}$